doppsat - reports the satellite down- and uplink doppler shifts,

doppsat - Reports the satellite down- and uplink doppler shifts

as well as down- and uplink frequencies, elevation, azimuth, and doppler speed for a given receiver and specified times.

SYNOPSIS

doppsat  [ parameter=value ... ]

Parameters are: satellite, pass_date, greenwich_time, duration, zero_elev, time_step, downlink_freq, uplink_freq, receiver_lat, receiver_lon, report_fields, print_header.

DESCRIPTION

doppsat reports the following values for the times specified by pass_date, greenwich_time, duration, and time_step parameters: satellite downlink doppler shift down_shift for a given satellite transmitter frequency downlink_freq, corrected downlink frequency downlink_freq+down_shift, satellite uplink doppler shift up_shift for a given satellite receiver frequency uplink_freq, corrected uplink frequency uplink_freq-up_shift, doppler speed, i.e. satellite's speed of approaching the receiver, and, also, satellite azimuth and elevation. $SATDATA/<satellite_name>/orbdata file with orbital elements for a given satellite must exist.

PARAMETERS

satellite: This is the name of the satellite. There is no default.

pass_date: This is the date. The default pass_date is today. See formats for valid date formats.

greenwich_time: This is the time (GMT). The default greenwich_time is the current time. See formats for valid time formats.

duration: This is the duration time. The default duration is 23:59:59. See formats for valid time formats.

zero_elev: OPTIONAL. If yes, report only at the time when satellite rising elevation is zero. If no, report at intervals defined by the time_step parameter. The default is no.

time_step: This is the time step. The default time_step is 1 second.

downlink_freq: This is the satellite transmitter frequency in Hz. There is no default.

uplink_freq: This is the satellite receiver frequency in Hz. There is no default.

receiver_lat: Latitude of the receiver (antenna). See formats for specification of latitude and longitude formats. The default value is retrieved from the file last_location.

receiver_lon: Longitude of the receiver (antenna). See formats for specification of latitude and longitude formats. The default value is retrieved from the file last_location.

report_fields: Fields to report. Valid responses are [downlink d_shift uplink u_shift speed elevation azimuth time]. Entering the same field more than once is not allowed.

print_header: OPTIONAL. Whether or not to print a header with the names of the fields being reported. The valid answers are [yes no]. The default is yes.

EXAMPLES

% doppsat satellite : char( 8) ? noaa-12 pass_date : char( 15) ? [95/08/15] greenwich_time : char( 15) ? [00:27:46] 15:29:00 duration : char( 15) ? [23:59:59] 15:30 time_step : real ? [1] 120 downlink_freq : real ? 30000000000 uplink_freq : real ? 20000000000 receiver_lat : char( 15) ? [32 53.54 N] receiver_lon : char( 15) ? [117 9.24 W] report_fields : char( 79) ? downlink d_shift uplink u_shift speed elevation azimuth time Downlink(Hz) Down Shift(Hz) Uplink(Hz) Up Shift(Hz) Speed(km/sec) Elevation(deg) Azimuth(deg) Time 30000664102.59 +664102.59 19999557264.94 +442735.06 +6.64 -0.84 +7.36 15:29:00 30000653834.07 +653834.07 19999564110.62 +435889.38 +6.53 +7.10 +4.84 15:31:00 30000610440.22 +610440.22 19999593039.85 +406960.15 +6.10 +18.54 -0.44 15:33:00 30000447694.10 +447694.10 19999701537.26 +298462.74 +4.47 +38.30 -15.74 15:35:00 29999934433.89 -65566.11 20000043710.74 -43710.74 -0.66 +57.33 -84.34 15:37:00 29999499446.68 -500553.32 20000333702.21 -333702.21 -5.00 +33.19 -137.01 15:39:00 29999376773.15 -623226.85 20000415484.57 -415484.57 -6.23 +15.71 -148.89 15:41:00 29999343878.12 -656121.88 20000437414.59 -437414.59 -6.56 +5.26 -153.52 15:43:00 %

FILES

orbdata

NOTES

All angles are in degrees. All frequencies are in Hz. Speed is in km/sec.

Last Update: $Date: 1999/05/10 20:13:28 $